Insecticides hamper the effectiveness of Trichogramma chilonis Ishii not only through the direct adult mortality but also reduces the parasitisation capability and per cent emergence from the parasitised host eggs which have been exposed to insecticides in field. In the present investigation, the treatments comprised biopesticides, viz. Bacillus thuringiensis var kurstaki 5% WP @ 0.5% and 0.1%, M. anisopliae (2×109 spores/g) @ 0.5%, Beauveria bassiana (2×109 spores/g) @0.5%, HaNPV (1 X 109PIB/ml) @ 0.2% synthetic insecticide cartap hydrochloride 50% SP @ 0.1% and aqueous leaf extract of neem and Parthenium (3% and 5%) were investigated. Results revealed that the very less parasitisation (0.00 to 8.67%) and adult emergence (0.0% to 28.33%) were recorded from cartap hydrochloride 50% SP @ 0.1% + HaNPV (0.2%), followed by the combination of aqueous neem leaf extract (5%) + Btk (0.1%) causes lowest parasitisation (10.00% to 27.33%), whereas lowest adult emergence (25.33% to 48%) were recorded from Parthenium leaf extract (3%) + Btk (0.1%) among botanicals and microbial insecticides. On the contrary maximum parasitisation (52% to 71.67%) and emergence (34.33% to 83%) recorded from HaNPV (1 X 109PIB/ml) @ 0.2%, followed by combination of HaNPV (1 X 109PIB/ml) @ 0.2% + Btk (0.1%) resulting 50% to 60% parasitisation and 35% to 75.67% emergence which show very less toxicity to T. chilonis Ishii.
Trichogramma chilonis Ishii, Bacillus thuringiensis var kurstaki, Beauveria bassiana, M. anisopliae, Microbial insecticides, Botanical insecticides.
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